Hey guys, new to the forum and I need some help. I have an 09 sstc with a muffler delete, I have been running it on a Superchip Cortex 91 perf tune for about 6 months. the tune is nothing special, but it makes it boost around 19 psi. Well the other day i installed an intake. not a cold air, just a cone filter,and it sounds great. the problem is that sometimes it only boosts 10-12 psi a WOT. but other times it goes all the way to 19. i tried puting it back to stock tune, but then the boost went down to like 8 psi. not sure what to do, because i like the way the intake sounds and the better throttle response. but its unpredictable when it will boost high or low. any thought on this would be greatly appreciated, thanks-Nick

 

I'm having the same problem, I would get around 23 psi with gmtu, then I put on the zzp intake and took off the plastic cover from above the radiator. Now I'm getting maybe 9 psi at WOT and a cel saying I'm running lean at idle. I'm pretty sure we just need an uncanned tune like trifecta or something. Either that or upgrade the injectors proportional to the new intake lol.

 

You need a good tune with an intake

 

You definitely do not need "injectors proportional to the intake,"

 

Lol no I think something else may be an issue here. Unless that tune really sucks, u should not drop in boost like that just cause u put a new intake on. Did u plug in ur maf sensor after install? But that would throw code. U need a good hp tune. And no u would not have to do anything with injectors, u have a long way to go before ud need to touch those.

 

I would double check all connections on the intake and make sure all couplers, clamps and pipes are properly seated and secured. It could be a leak of metered air after the MAF. Also the stock boost gauge isn't mechanical it uses info from the ECU. For 100% accurate pressure figures use a mechanical boost gauge.

 

HHR SS will go into limp mode with ZZP's intake installed without a tune GMS1 doesn't count, says so right on their site "tune highly recommended".


I saw a SS/TC baseline with full bolt ons and the tuner said it was VERY lean, and actually stopped the baseline pull early on the 2nd run.

I run an airbox mod on mine and just got a maf code recently. Doing my clutch soon then the boom tune comes out.